osama bin laden and some chargetheobamaadministrationgavethe film's producer certain access. barbara starr will be with us about that. thanks for joining us. "ac 360" starts now. >>> we begin with breaking news. new signs tonight the syrian government could be preparing to do the unthinkable, unleash chemical weapons on its own people. the united states has new intelligence suggesting syrian forces now mixing the ingredients used to make deadly serin gas. a serious civil war has progressed. the obama administration has repeatedly warned even just moving chemical weapons would be a red line that could draw a swift response. just hours ago, president obama directly addressing the assad regime about this latest intelligence. >> today, i want to make it absolutely clear to assad and those under his command, the world is watching. the use of chemical weapons is and would be totally unacceptable, and if you make the tragic mistake of using these weapons, there will be consequences and you will be held accountable. >> the world of course has been watching in horror at the atrocitie

deadly sarin gas. a serious civil war has progressed.theobamaadministrationhasrepeatedly warned even just moving chemical weapons would be a red line that could draw a swift response. just hours ago, president obama directly addressing the assad regime about this latest intelligence. >> today, i want to make it absolutely clear to assad and those under his command, the world is watching. the use of chemical weapons is and would be totally unacceptable, and if you make the tragic mistake of using these weapons, there will be consequences and you will be held accountable. >> the world of course has been watching in horror at the atrocities committed by the syrian government. that's why this fear of chemical weapons is so real tonight. we want to show you new video posted on youtube reportedly showing families just after their neighborhood became the target of a regime rocket attack. like so much video out of syria, cnn cannot independently confirm its authenticity. [ shouting in a foreign language ] [ shouting in a foreign language ] >> you can see the sheer terror for those families,